Three tier server



FIG. 1 is a perspective view of a three tier server showing a new design;

FIG. 2 is a front view of the three tier server of FIG. 1;

FIG. 3 is a rear view of the three tier server of FIG. 1;

FIG. 4 is a side view of the three tier server of FIG. 1;

FIG. 5 is a top view of the three tier server of FIG. 1; and,

FIG. 6 is a bottom view of the three tier server of FIG. 1.

The components of the display shown in broken lines illustrate portions of the three tier server form no part of the claimed design. 

CLAIM The ornamental design for a three tier server, as shown and described. 